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|
/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#include "audio/softsynth/emumidi.h"
#include "sci/sound/drivers/mididriver.h"
#include "sci/resource.h"
#include "common/file.h"
#include "common/frac.h"
#include "common/memstream.h"
#include "common/util.h"
namespace Sci {
//#define DEBUG
class MidiDriver_AmigaMac : public MidiDriver_Emulated {
public:
enum {
kVoices = 4
};
MidiDriver_AmigaMac(Audio::Mixer *mixer) : MidiDriver_Emulated(mixer), _playSwitch(true), _masterVolume(15) { }
virtual ~MidiDriver_AmigaMac() { }
// MidiDriver
int open();
void close();
void send(uint32 b);
MidiChannel *allocateChannel() { return NULL; }
MidiChannel *getPercussionChannel() { return NULL; }
// AudioStream
bool isStereo() const { return true; }
int getRate() const { return _mixer->getOutputRate(); }
// MidiDriver_Emulated
void generateSamples(int16 *buf, int len);
void setVolume(byte volume);
void playSwitch(bool play);
virtual uint32 property(int prop, uint32 param);
private:
enum {
kModeLoop = 1 << 0, // Instrument looping flag
kModePitch = 1 << 1 // Instrument pitch changes flag
};
enum {
kChannels = 10,
kBaseFreq = 20000, // Samplerate of the instrument bank
kPanLeft = 91,
kPanRight = 164
};
struct Channel {
int instrument;
int volume;
int pan;
uint16 pitch;
};
struct Envelope {
int length; // Phase period length in samples
int delta; // Velocity delta per period
int target; // Target velocity
};
struct Voice {
int instrument;
int note;
int note_velocity;
int velocity;
int envelope;
int envelope_samples; // Number of samples till next envelope event
int decay;
int looping;
int hw_channel;
frac_t offset;
frac_t rate;
};
struct InstrumentSample {
char name[30];
int mode;
int size; // Size of non-looping part in bytes
int loop_size; // Starting offset and size of loop in bytes
int transpose; // Transpose value in semitones
Envelope envelope[4]; // Envelope
int8 *samples;
int8 *loop;
int16 startNote;
int16 endNote;
bool isUnsigned;
uint16 baseFreq;
uint16 baseNote;
int16 fixedNote;
};
class Instrument : public Common::Array<InstrumentSample *> {
public:
char name[30];
};
struct Bank {
char name[30];
uint size;
Common::Array<Instrument> instruments;
};
bool _isSci1;
bool _playSwitch;
int _masterVolume;
int _frequency;
Envelope _envDecay;
Bank _bank; // Instrument bank
double _freqTable[48];
Channel _channels[MIDI_CHANNELS];
/* Internal channels */
Voice _voices[kChannels];
void setEnvelope(Voice *channel, Envelope *envelope, int phase);
void setOutputFrac(int voice);
int interpolate(int8 *samples, frac_t offset, bool isUnsigned);
void playInstrument(int16 *dest, Voice *channel, int count);
void changeInstrument(int channel, int instrument);
void stopChannel(int ch);
void stopNote(int ch, int note);
void startNote(int ch, int note, int velocity);
InstrumentSample *findInstrument(int instrument, int note);
void pitchWheel(int ch, uint16 pitch);
bool loadInstrumentsSCI0(Common::File &file);
bool loadInstrumentsSCI0Mac(Common::SeekableReadStream &file);
InstrumentSample *readInstrumentSCI0(Common::SeekableReadStream &file, int *id);
bool loadInstrumentsSCI1(Common::SeekableReadStream &file);
};
void MidiDriver_AmigaMac::setEnvelope(Voice *channel, Envelope *envelope, int phase) {
channel->envelope = phase;
channel->envelope_samples = envelope[phase].length;
if (phase == 0)
channel->velocity = channel->note_velocity / 2;
else
channel->velocity = envelope[phase - 1].target;
}
int MidiDriver_AmigaMac::interpolate(int8 *samples, frac_t offset, bool isUnsigned) {
int x = fracToInt(offset);
if (isUnsigned) {
int s1 = (byte)samples[x] - 0x80;
int s2 = (byte)samples[x + 1] - 0x80;
int diff = (s2 - s1) << 8;
return (s1 << 8) + fracToInt(diff * (offset & FRAC_LO_MASK));
}
int diff = (samples[x + 1] - samples[x]) << 8;
return (samples[x] << 8) + fracToInt(diff * (offset & FRAC_LO_MASK));
}
void MidiDriver_AmigaMac::playInstrument(int16 *dest, Voice *channel, int count) {
int index = 0;
int vol = _channels[channel->hw_channel].volume;
InstrumentSample *instrument = findInstrument(channel->instrument, channel->note);
while (1) {
/* Available source samples until end of segment */
frac_t lin_avail;
uint32 seg_end, rem, i, amount;
int8 *samples;
if (channel->looping && instrument->loop) {
samples = instrument->loop;
seg_end = instrument->loop_size;
} else {
samples = instrument->samples;
seg_end = instrument->size;
}
lin_avail = intToFrac(seg_end) - channel->offset;
rem = count - index;
/* Amount of destination samples that we will compute this iteration */
amount = lin_avail / channel->rate;
if (lin_avail % channel->rate)
amount++;
if (amount > rem)
amount = rem;
/* Stop at next envelope event */
if ((channel->envelope_samples != -1) && (amount > (uint32)channel->envelope_samples))
amount = channel->envelope_samples;
for (i = 0; i < amount; i++) {
dest[index++] = interpolate(samples, channel->offset, instrument->isUnsigned) * channel->velocity / 64 * channel->note_velocity * vol / (127 * 127);
channel->offset += channel->rate;
}
if (channel->envelope_samples != -1)
channel->envelope_samples -= amount;
if (channel->envelope_samples == 0) {
Envelope *envelope;
int delta, target, velocity;
if (channel->decay)
envelope = &_envDecay;
else
envelope = &instrument->envelope[channel->envelope];
delta = envelope->delta;
target = envelope->target;
velocity = channel->velocity - envelope->delta;
/* Check whether we have reached the velocity target for the current phase */
if ((delta >= 0 && velocity <= target) || (delta < 0 && velocity >= target)) {
channel->velocity = target;
/* Stop note after velocity has dropped to 0 */
if (target == 0) {
channel->note = -1;
break;
} else
switch (channel->envelope) {
case 0:
case 2:
/* Go to next phase */
setEnvelope(channel, instrument->envelope, channel->envelope + 1);
break;
case 1:
case 3:
/* Stop envelope */
channel->envelope_samples = -1;
break;
}
} else {
/* We haven't reached the target yet */
channel->envelope_samples = envelope->length;
channel->velocity = velocity;
}
}
if (index == count)
break;
if ((uint32)fracToInt(channel->offset) >= seg_end) {
if (instrument->mode & kModeLoop) {
/* Loop the samples */
channel->offset -= intToFrac(seg_end);
channel->looping = 1;
} else {
/* All samples have been played */
channel->note = -1;
break;
}
}
}
}
void MidiDriver_AmigaMac::changeInstrument(int channel, int instrument) {
#ifdef DEBUG
if (_bank.instruments[instrument][0])
debugN("[sfx:seq:amiga] Setting channel %i to \"%s\" (%i)\n", channel, _bank.instruments[instrument].name, instrument);
else
warning("[sfx:seq:amiga] instrument %i does not exist (channel %i)", instrument, channel);
#endif
_channels[channel].instrument = instrument;
}
void MidiDriver_AmigaMac::stopChannel(int ch) {
int i;
/* Start decay phase for note on this hw channel, if any */
for (i = 0; i < kChannels; i++)
if (_voices[i].note != -1 && _voices[i].hw_channel == ch && !_voices[i].decay) {
/* Trigger fast decay envelope */
_voices[i].decay = 1;
_voices[i].envelope_samples = _envDecay.length;
break;
}
}
void MidiDriver_AmigaMac::pitchWheel(int ch, uint16 pitch) {
_channels[ch].pitch = pitch;
for (int i = 0; i < kChannels; i++)
if (_voices[i].note != -1 && _voices[i].hw_channel == ch)
setOutputFrac(i);
}
void MidiDriver_AmigaMac::stopNote(int ch, int note) {
int channel;
for (channel = 0; channel < kChannels; channel++)
if (_voices[channel].note == note && _voices[channel].hw_channel == ch && !_voices[channel].decay)
break;
if (channel == kChannels) {
#ifdef DEBUG
warning("[sfx:seq:amiga] cannot stop note %i on channel %i", note, ch);
#endif
return;
}
InstrumentSample *instrument = findInstrument(_voices[channel].instrument, note);
// FIXME: SCI1 envelope support is not perfect yet
/* Start the envelope phases for note-off if looping is on and envelope is enabled */
if ((instrument->mode & kModeLoop) && (instrument->envelope[0].length != 0))
setEnvelope(&_voices[channel], instrument->envelope, 2);
}
MidiDriver_AmigaMac::InstrumentSample *MidiDriver_AmigaMac::findInstrument(int instrument, int note) {
if ((uint)instrument >= _bank.instruments.size())
return 0;
for (uint32 i = 0; i < _bank.instruments[instrument].size(); i++) {
InstrumentSample *sample = _bank.instruments[instrument][i];
if (note >= sample->startNote && note <= sample->endNote)
return sample;
}
return 0;
}
void MidiDriver_AmigaMac::setOutputFrac(int voice) {
InstrumentSample *instrument = findInstrument(_voices[voice].instrument, _voices[voice].note);
int fnote = 0;
if (instrument->fixedNote == -1) {
fnote = _voices[voice].note;
// Handle SCI0-style transposing here
if (!_isSci1)
fnote += instrument->transpose;
if (fnote < 0 || fnote > 127) {
warning("[sfx:seq:amiga] illegal note %i", fnote);
return;
}
} else
fnote = instrument->fixedNote;
// Compute rate for note
int mulFact = 1, divFact = 1;
fnote -= instrument->baseNote;
fnote *= 4;
// FIXME: check how SSCI maps this
fnote += (_channels[_voices[voice].hw_channel].pitch - 0x2000) / 169;
while (fnote < 0) {
divFact *= 2;
fnote += 12 * 4;
}
while (fnote >= 12 * 4) {
mulFact *= 2;
fnote -= 12 * 4;
}
double freq = _freqTable[fnote] * instrument->baseFreq * mulFact / divFact;
// Handle SCI1-style transposing here
if (instrument->transpose && _isSci1)
freq = freq + ((_freqTable[4] - 1.0) * freq * (double)instrument->transpose / (double)16);
_voices[voice].rate = doubleToFrac(freq / _frequency);
}
void MidiDriver_AmigaMac::startNote(int ch, int note, int velocity) {
int channel;
if (_channels[ch].instrument < 0 || _channels[ch].instrument > 255) {
warning("[sfx:seq:amiga] invalid instrument %i on channel %i", _channels[ch].instrument, ch);
return;
}
InstrumentSample *instrument = findInstrument(_channels[ch].instrument, note);
if (!instrument) {
warning("[sfx:seq:amiga] instrument %i does not exist", _channels[ch].instrument);
return;
}
for (channel = 0; channel < kChannels; channel++)
if (_voices[channel].note == -1)
break;
if (channel == kChannels) {
warning("[sfx:seq:amiga] could not find a free channel");
return;
}
stopChannel(ch);
_voices[channel].instrument = _channels[ch].instrument;
_voices[channel].note = note;
_voices[channel].note_velocity = velocity;
if ((instrument->mode & kModeLoop) && (instrument->envelope[0].length != 0))
setEnvelope(&_voices[channel], instrument->envelope, 0);
else {
_voices[channel].velocity = 64;
_voices[channel].envelope_samples = -1;
}
_voices[channel].offset = 0;
_voices[channel].hw_channel = ch;
_voices[channel].decay = 0;
_voices[channel].looping = 0;
setOutputFrac(channel);
}
MidiDriver_AmigaMac::InstrumentSample *MidiDriver_AmigaMac::readInstrumentSCI0(Common::SeekableReadStream &file, int *id) {
byte header[61];
if (file.read(header, 61) < 61) {
warning("[sfx:seq:amiga] failed to read instrument header");
return NULL;
}
int seg_size[3];
seg_size[0] = (int16)READ_BE_UINT16(header + 35) * 2;
seg_size[1] = (int16)READ_BE_UINT16(header + 41) * 2;
seg_size[2] = (int16)READ_BE_UINT16(header + 47) * 2;
InstrumentSample *instrument = new InstrumentSample;
instrument->startNote = 0;
instrument->endNote = 127;
instrument->isUnsigned = false;
instrument->baseFreq = kBaseFreq;
instrument->baseNote = 101;
instrument->fixedNote = 101;
instrument->mode = header[33];
instrument->transpose = (int8) header[34];
for (int i = 0; i < 4; i++) {
int length = (int8) header[49 + i];
if (length == 0 && i > 0)
length = 256;
instrument->envelope[i].length = length * _frequency / 60;
instrument->envelope[i].delta = (int8)header[53 + i];
instrument->envelope[i].target = header[57 + i];
}
/* Final target must be 0 */
instrument->envelope[3].target = 0;
int loop_offset = READ_BE_UINT32(header + 37) & ~1;
int size = seg_size[0] + seg_size[1] + seg_size[2];
*id = READ_BE_UINT16(header);
strncpy(instrument->name, (char *) header + 2, 29);
instrument->name[29] = 0;
#ifdef DEBUG
debugN("[sfx:seq:amiga] Reading instrument %i: \"%s\" (%i bytes)\n",
*id, instrument->name, size);
debugN(" Mode: %02x\n", instrument->mode);
debugN(" Looping: %s\n", instrument->mode & kModeLoop ? "on" : "off");
debugN(" Pitch changes: %s\n", instrument->mode & kModePitch ? "on" : "off");
debugN(" Segment sizes: %i %i %i\n", seg_size[0], seg_size[1], seg_size[2]);
debugN(" Segment offsets: 0 %i %i\n", loop_offset, (int32)READ_BE_UINT32(header + 43));
#endif
instrument->samples = (int8 *) malloc(size + 1);
if (file.read(instrument->samples, size) < (unsigned int)size) {
warning("[sfx:seq:amiga] failed to read instrument samples");
free(instrument->samples);
delete instrument;
return NULL;
}
if (instrument->mode & kModePitch)
instrument->fixedNote = -1;
if (instrument->mode & kModeLoop) {
if (loop_offset + seg_size[1] > size) {
#ifdef DEBUG
warning("[sfx:seq:amiga] looping samples extend %i bytes past end of sample block",
loop_offset + seg_size[1] - size);
#endif
seg_size[1] = size - loop_offset;
}
if (seg_size[1] < 0) {
warning("[sfx:seq:amiga] invalid looping point");
free(instrument->samples);
delete instrument;
return NULL;
}
instrument->size = seg_size[0];
instrument->loop_size = seg_size[1];
instrument->loop = (int8*)malloc(instrument->loop_size + 1);
memcpy(instrument->loop, instrument->samples + loop_offset, instrument->loop_size);
instrument->samples[instrument->size] = instrument->loop[0];
instrument->loop[instrument->loop_size] = instrument->loop[0];
} else {
instrument->loop = NULL;
instrument->loop_size = 0;
instrument->size = size;
instrument->samples[instrument->size] = 0;
}
return instrument;
}
uint32 MidiDriver_AmigaMac::property(int prop, uint32 param) {
switch(prop) {
case MIDI_PROP_MASTER_VOLUME:
if (param != 0xffff)
_masterVolume = param;
return _masterVolume;
default:
break;
}
return 0;
}
int MidiDriver_AmigaMac::open() {
_isSci1 = false;
for (int i = 0; i < 48; i++)
_freqTable[i] = pow(2, i / (double)48);
_frequency = _mixer->getOutputRate();
_envDecay.length = _frequency / (32 * 64);
_envDecay.delta = 1;
_envDecay.target = 0;
for (uint i = 0; i < kChannels; i++) {
_voices[i].note = -1;
_voices[i].hw_channel = 0;
}
for (uint i = 0; i < MIDI_CHANNELS; i++) {
_channels[i].instrument = -1;
_channels[i].volume = 127;
_channels[i].pan = (i % 4 == 0 || i % 4 == 3 ? kPanLeft : kPanRight);
_channels[i].pitch = 0x2000;
}
Common::File file;
if (file.open("bank.001")) {
if (!loadInstrumentsSCI0(file)) {
file.close();
return Common::kUnknownError;
}
file.close();
} else {
ResourceManager *resMan = g_sci->getResMan();
Resource *resource = resMan->findResource(ResourceId(kResourceTypePatch, 7), false);
if (!resource)
resource = resMan->findResource(ResourceId(kResourceTypePatch, 9), false);
// If we have a patch by this point, it's SCI1
if (resource)
_isSci1 = true;
// Check for the SCI0 Mac patch
if (!resource)
resource = resMan->findResource(ResourceId(kResourceTypePatch, 200), false);
if (!resource) {
warning("Could not open patch for Amiga sound driver");
return Common::kUnknownError;
}
Common::MemoryReadStream stream(resource->data, resource->size);
if (_isSci1) {
if (!loadInstrumentsSCI1(stream))
return Common::kUnknownError;
} else if (!loadInstrumentsSCI0Mac(stream))
return Common::kUnknownError;
}
MidiDriver_Emulated::open();
_mixer->playStream(Audio::Mixer::kPlainSoundType, &_mixerSoundHandle, this, -1, _mixer->kMaxChannelVolume, 0, DisposeAfterUse::NO);
return Common::kNoError;
}
void MidiDriver_AmigaMac::close() {
_mixer->stopHandle(_mixerSoundHandle);
for (uint i = 0; i < _bank.size; i++) {
for (uint32 j = 0; j < _bank.instruments[i].size(); j++) {
if (_bank.instruments[i][j]) {
if (_bank.instruments[i][j]->loop)
free(_bank.instruments[i][j]->loop);
free(_bank.instruments[i][j]->samples);
delete _bank.instruments[i][j];
}
}
}
}
void MidiDriver_AmigaMac::playSwitch(bool play) {
_playSwitch = play;
}
void MidiDriver_AmigaMac::setVolume(byte volume_) {
_masterVolume = volume_;
}
void MidiDriver_AmigaMac::send(uint32 b) {
byte command = b & 0xf0;
byte channel = b & 0xf;
byte op1 = (b >> 8) & 0xff;
byte op2 = (b >> 16) & 0xff;
switch (command) {
case 0x80:
stopNote(channel, op1);
break;
case 0x90:
if (op2 > 0)
startNote(channel, op1, op2);
else
stopNote(channel, op1);
break;
case 0xb0:
switch (op1) {
case 0x07:
_channels[channel].volume = op2;
break;
case 0x0a:
#ifdef DEBUG
warning("[sfx:seq:amiga] ignoring pan 0x%02x event for channel %i", op2, channel);
#endif
break;
case 0x7b:
stopChannel(channel);
break;
default:
warning("[sfx:seq:amiga] unknown control event 0x%02x", op1);
}
break;
case 0xc0:
changeInstrument(channel, op1);
break;
case 0xe0:
pitchWheel(channel, (op2 << 7) | op1);
break;
default:
warning("[sfx:seq:amiga] unknown event %02x", command);
}
}
void MidiDriver_AmigaMac::generateSamples(int16 *data, int len) {
if (len == 0)
return;
int16 *buffers = (int16*)malloc(len * 2 * kChannels);
memset(buffers, 0, len * 2 * kChannels);
/* Generate samples for all notes */
for (int i = 0; i < kChannels; i++)
if (_voices[i].note >= 0)
playInstrument(buffers + i * len, &_voices[i], len);
if (isStereo()) {
for (int j = 0; j < len; j++) {
int mixedl = 0, mixedr = 0;
/* Mix and pan */
for (int i = 0; i < kChannels; i++) {
mixedl += buffers[i * len + j] * (256 - _channels[_voices[i].hw_channel].pan);
mixedr += buffers[i * len + j] * _channels[_voices[i].hw_channel].pan;
}
/* Adjust volume */
data[2 * j] = mixedl * _masterVolume >> 13;
data[2 * j + 1] = mixedr * _masterVolume >> 13;
}
} else {
for (int j = 0; j < len; j++) {
int mixed = 0;
/* Mix */
for (int i = 0; i < kChannels; i++)
mixed += buffers[i * len + j];
/* Adjust volume */
data[j] = mixed * _masterVolume >> 6;
}
}
free(buffers);
}
bool MidiDriver_AmigaMac::loadInstrumentsSCI0(Common::File &file) {
_isSci1 = false;
byte header[40];
if (file.read(header, 40) < 40) {
warning("[sfx:seq:amiga] failed to read header of file bank.001");
return false;
}
_bank.size = READ_BE_UINT16(header + 38);
strncpy(_bank.name, (char *) header + 8, 29);
_bank.name[29] = 0;
#ifdef DEBUG
debugN("[sfx:seq:amiga] Reading %i instruments from bank \"%s\"\n", _bank.size, _bank.name);
#endif
for (uint i = 0; i < _bank.size; i++) {
int id;
InstrumentSample *instrument = readInstrumentSCI0(file, &id);
if (!instrument) {
warning("[sfx:seq:amiga] failed to read bank.001");
return false;
}
if (id < 0 || id > 255) {
warning("[sfx:seq:amiga] Error: instrument ID out of bounds");
return false;
}
if ((uint)id >= _bank.instruments.size())
_bank.instruments.resize(id + 1);
_bank.instruments[id].push_back(instrument);
memcpy(_bank.instruments[id].name, instrument->name, sizeof(instrument->name));
}
return true;
}
bool MidiDriver_AmigaMac::loadInstrumentsSCI0Mac(Common::SeekableReadStream &file) {
byte header[40];
if (file.read(header, 40) < 40) {
warning("[sfx:seq:amiga] failed to read header of file patch.200");
return false;
}
_bank.size = 128;
strncpy(_bank.name, (char *) header + 8, 29);
_bank.name[29] = 0;
#ifdef DEBUG
debugN("[sfx:seq:amiga] Reading %i instruments from bank \"%s\"\n", _bank.size, _bank.name);
#endif
Common::Array<uint32> instrumentOffsets;
instrumentOffsets.resize(_bank.size);
_bank.instruments.resize(_bank.size);
for (uint32 i = 0; i < _bank.size; i++)
instrumentOffsets[i] = file.readUint32BE();
for (uint i = 0; i < _bank.size; i++) {
// 0 signifies it doesn't exist
if (instrumentOffsets[i] == 0)
continue;
file.seek(instrumentOffsets[i]);
uint16 id = file.readUint16BE();
if (id != i)
error("Instrument number mismatch");
InstrumentSample *instrument = new InstrumentSample;
instrument->startNote = 0;
instrument->endNote = 127;
instrument->isUnsigned = true;
instrument->baseFreq = kBaseFreq;
instrument->baseNote = 101;
instrument->fixedNote = 101;
instrument->mode = file.readUint16BE();
// Read in the offsets
int32 seg_size[3];
seg_size[0] = file.readUint32BE();
seg_size[1] = file.readUint32BE();
seg_size[2] = file.readUint32BE();
instrument->transpose = file.readUint16BE();
for (byte j = 0; j < 4; j++) {
int length = (int8)file.readByte();
if (length == 0 && j > 0)
length = 256;
instrument->envelope[j].length = length * _frequency / 60;
instrument->envelope[j].delta = (int8)file.readByte();
instrument->envelope[j].target = file.readByte();
}
// Final target must be 0
instrument->envelope[3].target = 0;
file.read(instrument->name, 30);
if (instrument->mode & kModePitch)
instrument->fixedNote = -1;
uint32 size = seg_size[2];
uint32 loop_offset = seg_size[0];
instrument->samples = (int8 *)malloc(size + 1);
if (file.read(instrument->samples, size) < size) {
warning("[sfx:seq:amiga] failed to read instrument sample");
free(instrument->samples);
delete instrument;
continue;
}
if (instrument->mode & kModeLoop) {
instrument->size = seg_size[0];
instrument->loop_size = seg_size[1] - seg_size[0];
instrument->loop = (int8*)malloc(instrument->loop_size + 1);
memcpy(instrument->loop, instrument->samples + loop_offset, instrument->loop_size);
instrument->samples[instrument->size] = instrument->loop[0];
instrument->loop[instrument->loop_size] = instrument->loop[0];
} else {
instrument->loop = NULL;
instrument->loop_size = 0;
instrument->size = size;
instrument->samples[instrument->size] = (int8)0x80;
}
_bank.instruments[id].push_back(instrument);
memcpy(_bank.instruments[id].name, instrument->name, sizeof(instrument->name));
}
return true;
}
bool MidiDriver_AmigaMac::loadInstrumentsSCI1(Common::SeekableReadStream &file) {
_bank.size = 128;
Common::Array<uint32> instrumentOffsets;
instrumentOffsets.resize(_bank.size);
_bank.instruments.resize(_bank.size);
for (uint32 i = 0; i < _bank.size; i++)
instrumentOffsets[i] = file.readUint32BE();
for (uint32 i = 0; i < _bank.size; i++) {
// 0 signifies it doesn't exist
if (instrumentOffsets[i] == 0)
continue;
file.seek(instrumentOffsets[i]);
// Read in the instrument name
file.read(_bank.instruments[i].name, 10); // last two bytes are always 0
for (uint32 j = 0; ; j++) {
InstrumentSample *sample = new InstrumentSample;
memset(sample, 0, sizeof(InstrumentSample));
sample->startNote = file.readSint16BE();
// startNote being -1 signifies we're done with this instrument
if (sample->startNote == -1) {
delete sample;
break;
}
sample->endNote = file.readSint16BE();
uint32 samplePtr = file.readUint32BE();
sample->transpose = file.readSint16BE();
for (int env = 0; env < 3; env++) {
sample->envelope[env].length = file.readByte() * _frequency / 60;
sample->envelope[env].delta = (env == 0 ? 10 : -10);
sample->envelope[env].target = file.readByte();
}
sample->envelope[3].length = 0;
sample->fixedNote = file.readSint16BE();
int16 loop = file.readSint16BE();
uint32 nextSamplePos = file.pos();
file.seek(samplePtr);
file.read(sample->name, 8);
sample->isUnsigned = file.readUint16BE() == 0;
uint16 phase1Offset = file.readUint16BE();
uint16 phase1End = file.readUint16BE();
uint16 phase2Offset = file.readUint16BE();
uint16 phase2End = file.readUint16BE();
sample->baseNote = file.readUint16BE();
uint32 periodTableOffset = file.readUint32BE();
uint32 sampleDataPos = file.pos();
sample->size = phase1End - phase1Offset + 1;
sample->loop_size = phase2End - phase2Offset + 1;
sample->samples = (int8 *)malloc(sample->size + 1);
file.seek(phase1Offset + sampleDataPos);
file.read(sample->samples, sample->size);
sample->samples[sample->size] = (sample->isUnsigned ? (int8)0x80 : 0);
if (loop == 0 && sample->loop_size > 1) {
sample->loop = (int8 *)malloc(sample->loop_size + 1);
file.seek(phase2Offset + sampleDataPos);
file.read(sample->loop, sample->loop_size);
sample->mode |= kModeLoop;
sample->samples[sample->size] = sample->loop[0];
sample->loop[sample->loop_size] = sample->loop[0];
}
_bank.instruments[i].push_back(sample);
file.seek(periodTableOffset + 0xe0);
sample->baseFreq = file.readUint16BE();
file.seek(nextSamplePos);
}
}
return true;
}
class MidiPlayer_AmigaMac : public MidiPlayer {
public:
MidiPlayer_AmigaMac(SciVersion version) : MidiPlayer(version) { _driver = new MidiDriver_AmigaMac(g_system->getMixer()); }
byte getPlayId() const;
int getPolyphony() const { return MidiDriver_AmigaMac::kVoices; }
bool hasRhythmChannel() const { return false; }
void setVolume(byte volume) { static_cast<MidiDriver_AmigaMac *>(_driver)->setVolume(volume); }
void playSwitch(bool play) { static_cast<MidiDriver_AmigaMac *>(_driver)->playSwitch(play); }
void loadInstrument(int idx, byte *data);
};
MidiPlayer *MidiPlayer_AmigaMac_create(SciVersion version) {
return new MidiPlayer_AmigaMac(version);
}
byte MidiPlayer_AmigaMac::getPlayId() const {
if (_version > SCI_VERSION_0_LATE)
return 0x06;
return 0x40;
}
} // End of namespace Sci
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